The difference is plating on contact area. HR10A-13P-20P(73): Silver HR10A-13P-20P(74): Gold

The difference is housing(insulator) color. DF62*-**EP-2.2C :　Black DF62*-**EP-2.2C(10) :　White　

The difference is thread. HRM(G)-300-467B-1 : UNC thread HRM(G)-300-467B-2 : Metric thread These connectors don't come with male screw.

The difference is gold plating thickness on contact area. FX2B-**SA-1.27R : 0.05μm FX2B-**SA-1.27R(02) : 0.2μm

​The difference is packaging. DF13EA-**DP-1.25V(52) : Emboss tape, 1,000 pcs a reel DF13EA-**DP-1.25V(65) : Tube(stick).

The difference is "C"-shape insulator. BNC-LR-PC(40) :  Without "C"-shape insulator BNC-LR-PC-1B(40) :  "C"-shape insulator is assembled(Scheduled to be discontinued) "C"-s...

The difference is the color of housing. GT17H-4P-2H(55) : Light gray GT17H-4P-2H(A)(55) : Brawn GT17H-4P-2H(B)(55) : Green GT17H-4P-2H(C)(55) : Blue

The difference is quantity a reel. DM3AT-SF-PEJM5 : 1,500 pcs/reel DM3AT-SF-PEJM5(40) : 400 pcs/reel The connectors are the same.

The difference is outer plating. BNC-LR(40)　：　Silver(Scheduled to be discontinued) BNC-LR(43)　：　Nickel BNC-LR(44)　：　Discontinued BNC-LR(43) is recommended because o...

The difference is the dimensions of the part to be locked. As the difference is only 0.3mm, they are interchangeable.​However, 60 contact are not compatible.